Credit & Copyright: Russell Croman
Explanation: It's the bubble versus the cloud. NGC 7635, the Bubble Nebula, is being pushed out by the stellar wind of massive central star BD+602522. Next door, though, lives a giant molecular cloud, visible above to the lower right. At this place in space, an irresistible force meets an immovable object in an interesting way. The cloud is able to contain the expansion of the bubble gas, but gets blasted by the hot radiation from the bubble's central star. The radiation heats up dense regions of the molecular cloud causing it to glow. The Bubble Nebula, pictured above in scientifically mapped colors to bring up contrast, is about 10 light-years across and part of a much larger complex of stars and shells. The Bubble Nebula can be seen with a small telescope towards the constellation of Cassiopeia.
说明：这是一张云气泡泡的照片，它的学名为NGC 7635，又称泡泡星云，正在
不断地将中央大质量星球 BD+602522的恒星风向外推出。紧邻在其旁边的是一
个巨大的分子云。来自中央星球的高温辐射加热分子云的密集区域并使它发光。泡
泡星云的大小约约 10 光年，并且是更大、更复杂的星球与泡泡的一部份。上图
采用了有科学意义的颜色，以提高对比性。
原文来自：
http://antwrp.gsfc.nasa.gov/apod/ap051107.html
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ops: 
我去告诉朋友们去了，顶了再走。